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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b11aa488d30153d0de3f4acdd9b205d4c519bc6b900af10c919a614c1c79305' 
  AND token = 'rz+AD2RZiw3p7jVykyqVPlW3whrJkuHm0a6ADkfrJk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}